Terrorist attacks in Europe have become so commonplace over the last few months that we don’t even flinch when the alerts come across on our television or cell phone. In the latest horrifying strike, at least seven have died and dozens were injured when a group of terrorists ran over pedestrians on the London Bridge and then used knives to attack other innocent civilians.

We’re slowly learning more about Khuram Butt, Rachid Redouane and Youssef Zaghba, the three terrorists killed by police in the wake of the attack.

Perhaps most disturbingly, authorities could only confirm that one of the three men — Butt — was on the radar of British law enforcement at the time of the attack.

However, that likely shouldn’t have been the case. According to CNN, attacker Youssef Zaghba had been on a terrorism watch list in Italy.

Zaghba, who was Moroccan-Italian, had been stopped at an airport in Bologna last March as he was about to board a plane bound for Istanbul. He was found to have extremist material on his cell phone. That’s not against Italian law, though, so he couldn’t be arrested.